Prepay-box for use in telephone systems.



0. BRISBOIS.

PREPAY BOX FOR USE IN TELEPHONE SYSTEMS. y APPLICATION FILED FEB.8.1915.

1,160,570 Patented Nov. 16, 1915.

isHEErs-SHEET 1.

o. BRISBQIS. PREPAY BOX FOR USE IN TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 8. I9I5.

1,160,570. Patented Nov. 16, 1915.

7 SHEETS-SHEET 2.

. 7 y 'm A :Fu/93 /o "2' o Witneses: Inventor:

Odilon Briboi fr@ www/n www,

ffii/icy.

0. BRISBOIS.

PREPAY BOX FOR USE IN TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 8. I9I5.

1 l 60,570, Patented Nov. 16, 1915.

7 SHEETS-SHEET 3.

am@ G #fw (i4/-' v Odilon Brz'boz's 0. BRISBOIS.

PREPAY BOXFOR USE IN TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 1915.

Patented Nov. 16, 191V.

7 SHEETS-SHEET 4.

Inventor:

Witneses:

ojmsols.

PREPAY BOX FOR USE IN TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 8.1915.

Patented Nov. 16, 1915.

T SHEETS-SHEET 5.

momo.

m0 n b 1B n w im O f La 5 www@ 0. BRISBOIS.

PREPAY BOX FOR USE IN TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 8.1915.

Patented Nov. 16, 191" 7 SHEETS-SHEET 6.

Witnees:

Inventor:

J 0 b S v, B n w Mm fw O l I nuwe@ fffw E576 0. BRISBOIS.

PREPAY BOX FOR USE INl TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 8. 1915.

v rPatented Nov. 16, 1915.

7 SHEETS-SHEET 7.

Inl/enzow.'

. ODILON BRISBOIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOHN To all z/:wmvz't may concern.

ILLINOIS.

PREPAY-BOX FOR .USE IN TELEPHONE SYSTEMS.

Specification of Letters Patent.

Patented N ov. 16,1915.

Application led February 8, 1915. Serial No. 6,837. s'

Be it known that vI', ODILoN Bnisors, a

citizen of the United States, and a resident.

of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Prepay-Boxes for Usein Telephone Systems, of which the following is a specification. l

This invention relates to a toll boX suitable for Iuse in a two wire telephone system of that class in which a prepay or pre-payment is required before a signal can be given by the party desiring to use the telephone.

The invention has particular reference to a party line system, and the construction herein illustrated and described, and which embodies the invention, is well adapted for use in what is known as the automatic type of telephone systems; that is, those systems whereinselective mechanism at a central station is substituted for skilled operators, as the meansof establishing the circuit desired. ln systems. of this character the selective mechanism referred to is operated by impulses of current which are delivered by mechanisms which may be and usually arel mounted in the bases of the several tele; phone instruments which are installed in the system. And in these systems a plurality of telephone instruments are installed on a` given circuiv from the central station, and any one of said instruments may use the line as a calling or4 called station. The instruments which are included in these stations which are adapted to call vor toy be called comprise, usually, the telephone, the ninging box, the coin box, and the adjacent'and. interrelated connections,

The object of this invention is to obtain a device of the kind named, by means of which when a circuit'has been established by any oneof the several party stationsy on a given circuit thehsame cannot be interl rupted or broken by aparty at any of. the

remaining stations on said circuit: to obtain a device by means of which a partyat a` given stationwho is attempting to establish a circuit which shall include aldesi'red station, will be 'advised whether -theysde of said circuit which comprisessaid given sta-4 tion is or isnot already in use; to obtain a device by means offwhich a party desiring to establisha circuit which will include as elements thereof the telephone transmitters and receivers of the calling and the called stations, Awill retain control of the inal disposition of the coin which is requiredto be H.. wenn, on cgi-nonno,

inserted in the slot or runway. provided therefor, until said party at said calling station 1s made aware that said called station is not in'use otherwise and has responded to said call; and a device by means voff which,

upon the failure of said calledstation to f respond to said call, said calling partyis advised of said failure, and the coin which has been inserted, as' aforesaid, may be re' gained. A Additional and important objects sought by me are to obtain.` such interdependence lbetween the operation of the'si'gnaling and 'selector mechanisms, the listening and talk'- ing mechanisms, and thecoin box mecha-l nism as to make it imperative that a calling party place a coin in the runway or slot provided therefor before he can obtain operative actuation of his'selector mechanism to in a receptacle provided therefor, and be'-y yond his control, before a conversation with said called arty can be carried on; hence, the mechanlsm embodying means to ed'ect the last above recited4 objects. require the calling party-to insert a coin in the slot or runway of the device before he can make a call, and on being advised that his. call is responded to, to deposit said coin beyond his control lbefore h e can converse with said called party, .while ifV the call is not 'responded to he can regain-said coin. v

nthe drawings accompanying and forming a part vot this specificationr Figure 1 shows a vertical section of a device embodying the invention, on line 1-1 of Fig. 2',

viewed 'in the direction indicated, by the arrows. Fig. Q showsa 4vertical section on line 2,-2 of Fig. 1, viewed in the direction indicated by the arrows. Fig. 3 represents a vertical section on lined-3 of Fig. 2,

viewed in the direction' indicated by the arrows, the parts'shown being viewed ,at .an angle of 180 degrees from lthe view shown in Fi 1. Fig. 4l shows a horizontal section on line 4--4 of Fig. 3, viewed in 'the direction indicated by the arrows. Fig

yshowsin detail the oat arm of the device,

coin partially and the contact. leaves thereon, said leavesl 'standing in their normal position. Fig. 61l shows a view similar to Fig. 5, 'of the parts illustrated in said Fig. 5,'with the contact leaves forced down by a coin resting on the float arm. Fig. 7 isja bottom plan view of the selective inechanismrin'a telephone stand, which is adapted to behsed in a telephone 'system y which is equipped with devices embodying this invention. Fig. 8 is a vertical Section on line 8-8of Fig. 7, viewed in the direction indicated by the arrows.y Fig. 9 is va detail ofthe terminals of the selective mechanism whichis illusti'ated in Fig. T. Fig. 10 isa diagram of thecondition of the circuits of the device, Ehen installed. on' a party line, the receiver eing provided therefor, and thel device being in a usable condition,` showing in elevation a device. Fig. H is an elevation of,`a lock lever 'and latch thereto, iii position notper- `initting the insertion of a coin in the coin slot. Fig. 12 isa diagram illustrating' a circuit in which the selective mechanism lof' the telephone instrument is' an element, the receiver being .oi its hook and a coin on the oat bar of the device'. Fig. '13 is a diagram illustrating a circuit which is established 4when said receiver is oif the hook therefor,

a coin ispon said float arm, and the push \button of the device is depressed. Fig. 14:

'is a diagram illustrating a,circuit which is established when said receiver is oi said hook, said coin has been discharged from said float arm, and the push button has been returned to its normal and initial position. Fig. v15'i's a side elevation of the contact points which are controlled by the receiver and hook therefor,

points in position with the receiver'on its hook. In Fig. are illustrated in Fig. 15 are shown in position with the receiver off the hook therefor; and what I term thetalking circuit is established. To break said circuit and establish what l term" the normal circuit of the device it is simply necessary to return said receiver to said hook, thus bringing said Contact points into electrical connection.

In the construction which is illustrated in Figs. 1 to 7 both inclusive, placing a coin in the -coiii slot and on the oating bar of the device places the calling party in circuit with the central selective mechanisms,

' and upon operation of the selective' mechanism in the telephone' instrumentv by `the calling party the called station is in thel circuitwhich is established; and iii case` the called party is not obtained, yeither'by his failure to raise the receiver 0E the hook therefor in the calledA station, or by reason of the mechanism failing to operate properly, the original coincan'be regained, 'by

on the hook ofthe stand which is 'inserted' in the slot of the ,i

showing 'said' contact 14 the contact points which means hereinafter set forth, and anaddtional attempt to obtain said station may be made. 'f

To advise the party calling that the desired circuit has been established,- and thatA a. party at said called station has raised the telephone receiver off from the hook thereof; that is, the call is responded to; means are provided whereby, a coin being on the float arm. and the receiver at the calling station being oil" `the hook, the

receiver and transmitter of Said calling sta-l /tion are bridged .directly `across the` line; and. to prevent conversation being carried on while permitting the response to be heard by the calling party, sufficient resistance is interposed-'in said bridging circuit wto force some of the current generated by said response through the receiving circuit of the calling'station; hence the calling party can imperfectly hear a response given to him by the called arty. It becomes necessary, therefore, foi) the calling party to break said bridge, by removing said -coin from said floating arm,and means are provided so that the coin removed under or' at the time of thelast above recited conditions will be deposited in the safe of the. device.

In the constructions which inthe drawings there is a casing. comprising a base. and a shell or cover. said shell being provided with a coin slot for receiving a coin and an additional slot for discharging' said coin from said casing. when desired, a tray to receive a coin discharged from said last named slot, a locking bar t-o control the admission of acoin to said first` named slot. a latch to said locking bar. an electro-magnet to control theposition of said latch. a resistance coil. and a circuit in which said resistance coil and the coils ofv said electromagnet 'are elements, a runwayfrom said receiving adapted to receive'a'coin discharged from said runway, additional runways respectively adapted to receive a coin discharged from said loat'arin. a safe, one of said last named runways adapted to discharge into said tray and the other'into said safe. anv

electroniagnet adapted to control said float arm.v and a circuit in which the lcoils of said electromagnet are elementswith additional are illustrated slot. a float arm. or oat bar.'

circuits hereinafter set forth. There is such interconnection and inter-relation vbetween `the several elements entering into the construction ofthe device embodying this invention and' the selecting mechanism. the standard. receiver hook post, the receiver and transmitter, and what may be termed' the signaling and talking circuits of the automatic telephone instrument to which this device is attached as is required to obtain; the results sought, and so much of the construction of said telephone instrument as is required to understand this device and its madero X a given part indicates-said part throughout vthe. several figures ofthe drawings, wherever the same appears.

1 designates the base of a coin box; 2 the I shell or coverthereof; 3 a slot adapted to atl receivea coin; and 4 a runway. 5 indicates a. float arm, or float bar; 6 and 7, respectively, indicate runways; `8 a tray; 8 a slot adapted to discharge into said tray; and 9r a safe, or coin receptacle.

10 designatesa lever which is hereinafter referred to, in connection with a latch (12), as a' lock; andl 11 a screw which serves as the pivot on which lever 10 turns, and also as the means wheneby the plates or sheet's of metal in 'which the several runways are' pressed, are held together in proper relative position.

'11'1 is a leaf contact point, and 12a isa stationary contact point adapted to co-act with lsaid leaf contact point. Latch 12 is mounted on the spring 13, underneath the' free, or movable, end of lever 10, when in its normal position, to Aprevent its depression. Latch 12 is shown made of soft iron andjforming the armature of electromagnet 14.

15 and 16 are electromagnets, and'17I` is the armature of said magnets. y'Ifhe float. arm, or oat bar 5 is attached to 18 is a resistance coil.

19 is a push button.

In the several drawings 20 represents a conductor from an 'exchange,which is indicated by the numeral 22, and 21 represents an additional conductor from said exchange.

23, 24, 25, and 26 wrepresent line conductors from conductors 20, 21, to subscribing party stations. Y u

27 and 28 are the two Wiresor conductors of line A26, and lead to the stationwherein a toll box embodying this invention is installed. The call or ringing box of .said station embodying this invention is Adesignated 29; and it is provided with' the usual ringing coils 30, 31, and condenser 32.

33, 34, designate terminals to the ringing coils 30, 31, respectively; and designatesi the terminal to condenser32.

36 designates the base of the telephone instrument, 37 the-transmitter and 38 the re'- ceiver. The hook on which the receiver normally hangs, or rests, isnot illustrated, as it is operate'din the usual manner, by placing 'the receiver lthereon and removing it therefrom, and of coursel forms, of'ltself, no

new feature in the device. The hanging of the receiver on its Ihook and removing it therefrom performs the usual operation of raising and lowering a post orrod, and said. post or rod is designated by the numeral 39.`

The raising and lowering rod or post 39 raises and lowers the leaf contact 40.'v i

.Fig 12), terminal 59,

armature 1 7. Y

somber) operation of the device..

ffii.

In Fig. 8`the post is shown depressed, that is, with the receiver oil" of its hook,and said leaf Contact is shown in contact with contact 42. lVhenthe receiver is placed on its hook said leaf contact 40 is raised and4 comes in Contact with contact 41. '43, 44, 45 and; 46 are the contact points of a signal mechanism such as is'ordinarily used onan automatic telephone points 43 and 44 being norf wherebv whenjthe'signaling mechanism is 1 so l 43 and '44 come together an impulse of cur-l t v rent must be delivered to the line,.over ai circuit hereinafter described. Spring cons.; tacts 45 and 46 thus which is to vclose the circuit comprising, .(seef conductors 67, 68, 70, contact points 45, 46, conductor 72 and terminal 64, and shunt the telephone instru# ments on Ithe'circuit which comprises said terminals, the .conductor 57, transmitter 37,-

185' perform their function ,jv i

conductor'58, terminal 60, conductor 64, terminal 63,y conductor 61, 'receiver 38, con-vv ductor 62;. and the said closingof contacts 45, 46, I,constitute the succession of makes amd 'breaks which are being made inseries circuit over the two sides of the line during the selecting operationswhich, (under the Icontrol of the calling subloperate at the central station to complete the connection.4 47y is a leaf contact point which is raised and depressed by the vraising and depressing of the push button 19. 48 1s a contactpoint with which contact point 47 is normally-inl elec-4 tric contact; that is, when push button19-is not in' a .depressed position. y48a is a contact point wlth which said vleaf contact point 47 is in electrical contact when said contact point47 is depressed, by depressing the push button.

Before designating and, describing the several connecting wires, about vthe toll box' embodying vthis invention I will give, lin abrief form, the' different circuits whichare established inthe 1. A ringing circuit which is .indicated-v onl Fig. 10 by an arrow lettered R This circuit is established by hanging the receiver vor leads, -in and on its hook when use of the telephone is discontinued. When this, circuit is energized at a called station a signal is given.

2. A talking circuitwhich is indicatedV on Figs. 12 and 14 by an arrow lettered T.

This circuit is established by taking there# ceiver. oil'l its hook. In non-pay stations this circuit is used, immediately it is established,

f to send 'operating pulsations from a calling station to the selective mechanism at the central station ofthe system; and (elther from non-pay stations or from stations where this device'iis installed) this is the circuit over which, (a\ erl connection between a calling and a called y'station hasbeen made), conversation-lis"carriedon. At stations wherre I this ldevic'eisinstalled operation of the se- 3. An interlocking or interconnectingcir` cuitwhich is indicated in Figs. 10 and 1l by an arrow lettered l I This circuit is establishedat all times when' no c oin is on the c float bar 5; and is adapted to be venergized 4on the establishment of the T circuit,

.with which it is interconnected. It shunts the signaling'mechanism of the-,calling station and interferes with the operation of the signaling mechanism. -This circuit is broken by the welght of a coin on the float bar 5, and when 1t 1s broken operating pulsations may beV sent from said selecting mechanism of the calling station to the se-` the selecting mechanism at the calling sta.

lective mechanism of the central station. .4. An unlocking circuit, which 'is indicated by an arrow lettered U in Fig. 10, This circuit is established and energized by attempting to put la coin in slot 3 of the toll box. When the device is installed at a station 'in' a' party' linesysten and the line y v 1s not 1n use,

the establishment and energizing of this circuit unlocks the slot (3) and a coin can bexinserted If the party infuse byother-subscribers at the time an attemptis `made to insert acoin insaid slot the circuit will'beestablished,y but will not Abe suiliciently energized to operate the unlocking mechanism oftheslot, and said coin cannot 'be inserted therein; ,rv

45. A- si-gnalingscircuit which is indicated by the arrows lettered S in Fig.` 12. This circuit is'established byv the establishment of the TAA nd the breaking of; the I ci-rcuits. When this circuit isd established.

- tion lsadapted'to send operating pulsations toltheselective mechanism at theV central station, andthe calling party, byoperating said selecting mechanism, willobtain 'cnvnection with the called station, v will vbe given at said called station.

6. A, listening .crcuitwhich is indicated i by the arrows lettered L in 12. This circuit isestablished at the same time and by the'same `means asthe S -circuit lis established; but is not usable until the selective mechanism at the central 'station has. been operated, a connectionhas been`r made with a? called station and the receiver at said called station has been taken ott `its hook.

B y means of circuit a response from# the called station is.zmdibleybut` conversa- `1 and a signal.v

tion cannot be-carried on until thetB` cirbroken.

7. A bridgecircuit which is indicated by an arrow 4lettered B .in Fig. `12. This circuit is established by the establishment of cuit, which is about to be described, 1s l the S and the breaking of the I circuits.

It bridges the telephone receiver and transmitter, and' is broken by the discharge of a coin from float bar 5, on depression of the push button 19.

s. .a anal CircuitY wiich'is indicated by arrows lettered F in Fig. 13. This circuit is established to ei'ect the discharge of a coin from 'the ioat bar. When the F cir-A cuit is closed the resistance of coils 15 and 16,-

(which are-elements of this circuit), is so high that the current on the line is not suiiicient to actuate the selective mechanism at the central station, and hence, if'the receiver at the calledv station has not been removed from its hook before the establishment of said F circuit,'the connection will be discontinued; on the other hand, if said receiver has been removed from its hook the establishment of this circuit will not break or discontinue saidV connection. -lVhen this circuit is established and theconnection with the called station is discontinued, the circuit is locally'energized, and therebyfloat arm, or bar, coin .Qn'said float bar into runway 6, through nection with said called station is notfdisconnected,-` (the receiver at said called station being oil' its hook) said circuit is enerized fromsaid called station,

oat arm 5 is moved to discharge said coin from said oat Varm to runway v7, through whichitmoves to safe 9. Referring again to the several connections or leads on the'drawings, incoming wire` 27 5, 1s moved to. ,discharge theV which-it-moves to tray 8a. When said e011-,

ad therebyis connected to leaf contact point 47. 49'is a 'lead from contact point 48 to terminal 33.

50 is a post in the base ofthe telephone instrument, `and 51 is a lead from post/)50 toA 1s established between the telephone andthe line during ordinary service. this dervice the incoming wire extends to the leaf contact 47, thence through contact 48 vand on lead 49 to terminal 33; thence on lead .51 to said post 50; and the outgoing wire.eX-` /tends from terminal 34 onilead 51 to post 52. A lead 55 'connects the post 50 to' leaf contact 40, anda lead 56 connects the sta-- tionary contact point 41 with the ringing -post 54:.

From the foregoing it will be seen that as'l isc the push button (19) is in its normal condition, a connection is established between the posts 50 and 54, thereby placing the ringing box directly across the lines 27 and 28, forming what 1 have termed the R circuit. lVhen thus connected the ringing box is ready to receive any ringing currents which may be delivered over the lines from the exchange. Y

The transmitter is connected by the leads 57 and 58 with'a air of transmitter posts, 59 and 60, in the base of the instrument, and the receiver is connected by apair of leads 61 and 62, with the pair of receiver posts 63 and- 64, in said base. A permanent connection, 65, is placed between the posts 60 and 63, so that said'fpo'sts always are in electric connection.

The lead 66 connects the leafcontact 42 with the post 64, and when the receiver isl ofl` its hook, 'asin Fig. 12, direct connection is established with one side of the receiver.

.Thence the circuit extends through theA connection 65 to the transmitter, Jthus placing the receiver and transmitter in series.

lead 67 connects the' post 59'to the contact points 43 and 45 of the signaling mechanism, through the medium of the leads 68, 69 and 70, and a lead, 71, places `the contact point 44 in connection with the post 52, so'v that as long as the points 43 and 44remain in contact communication is established between the transmitterpost-59 and the outgoing line post 52.

From the foregoing it will be seen that as soon as the telephone receiver is raised from its hook the ringing circuit is brokemby reason of the forcing of the leaf contact 40 away from the contact point 41; butthat immediately thetransmitter and receiver.

are bridged across the line by the closing ofthe contact points between the leaves 46 and 42. Under these circumstances a conversation may -be carried on, in the usual manner.' with any called station which has been Jplaced an an established circuit, so

soon as the receiver at said called station has been taken off its hook. This circuit is indicated in Fig. 12 by the arrow marked T, and consists of the elements 27, 47, 48, 49,

51. 50, 55.l 4o, 42, ce, c4, e2, 38 (the receiver). 61, 63,. 65, 60,58, 37 (the transmitter) 57, 59, 67, 68, 69, 43, 44, 71, 52, 51, 34 and 28.

To signal the central exchange, so as to operate "the selective mechanism there, `the contacts 45 and 46 are to. be brought together th'edesired number of times to give the desired number of impulses orfpulsations of current on the line for operating the selective mechanism. This signaling current is sent directlyto the exchange, (not purpose the receiver post 64 is connected by lead 72 to contact point 46, so that said rcon-y tact point will be brought to potential equal to that of the incoming line 27 the instant the telephone receiver is raised from itshook. So soon as the receiver has ,been` raised, so as to energize the contact point 46 the signal mechanism may be operated. This will bring the points 45 and 46 together, and each time the points 43 and 44 come together an impulse of current will be delivered to the line. Such impulse will be delivered over the' circuit which is indicated by the arrow lettered S, and comprises the elements 27, 47, 48, 49, 33, 51, 50, 55, 40, 42, ce, c4, 72, 46, 45,170, 69, 43, 44, 71, 52, 51,4,

- 34 and 28.

cuit-I, which isbased on the principle that the selective mechanism of.. thev exchange will only operate through the Inedium of pulsations vof current` properly delivered from the calling station. The means which I employ in the construction .illustrated comprises contact points 82 and 83 on float arm 5, leads 89 and 90, terminals 84 and 85, leads 94 and 95, and the contact points 43, 44 and 45. To understand the. manner in which *this lPcircuit-is broken the construction kof the vfloat bar, or oatiarm, 5 will behereexplaineiand its operation.

i Float bar 5 is'pivoted inthe usual manner,

at 74, and adapted, when in'its-neutral position, to retain i a cointhereon; and arranged -to swing to and from `said neutral position. vThe direction in which said oat bar swings is controlled by the direction of the current'lthrough thefcoils'` of electromagnets 15 and 16, to delivfzr` a cointhereon into runway 6 or 7. When said coilsfare'.-

energized by a local current-said coin is delivered into runway 6 and trayk; and

vne

when energized by a current from-thecalled",V station said coinis delivered into krulrivvlay 7 and safe 9. lf the receiver at the called station is on its hook at the time of the establishment of the F circuit said coiny is delivered to runway 6, and if said receiver is 01T its hook at said time "it is delivered to runway 7. Said float arm carries the upper,

Contact leaf 75,' and the -lower contact leaf 76,'and these leaves normally stand in the position in which they are' illustrated 'in Fig.5. f

77 and78 are insulating blocks interposed Ybetween the respectiveleaves 75 and 76 and said Heat 'arm 5. n `insulating plug 79 joins minal 84 connects to contact point b v 25,

Y concerned.

the leaves 75 vand 76 mechanically together,

although they are electrically separated, and leaf 75 Lprojects into the path of a coin on said arm 5. Leaf 7 5 also carries thecontact point 80which is adapted to come in contact with-the electric point 81, and does so come 1n ontact when aJ coin is on'said leaf. -Point` 81 is -Yelectrlcally insulated from arm 5. i

82 is a contact point Whichis carried by "leaf '76, and 83 ,is an electric point which is mounted on said arm 5, but electricallyinsulated therefrom. A84, 85, 86, 87 and 88 are terminals of the coin box. ,I Leaf 76 is an electric conductor, and terminal V82 is elec-l tricall)y connected tosterminal 84 through the medium of said leaf and lead 89. Contact point 83 is elcctricallt7 connected to terminal 85- lead 92. the terminal 87 b3* means of lead 93. Ter

means of lead 94, and terminal 85 connects to contact point 43 by means of'lead 95.

` Terminal 86Y connects to the receiver post 64 b v means VYof lead 96. and the terminal 87 connects to the transmitter post 59 by means of 'lead 97. Post 59 is connected to contact 43 by leads 67 and 69 and post 5:2,is con.

nected to.contact 44 bv means of lead 71.

Said contacts 43and 44 are connected .also

b v means ot leads 94.395. terminals 84, 85, leads 891 90. and contacts 82.*83. It will be seen that contacts and 83 remain closed. anv opening. or closine. (or making and breaking) the contact points 43 and 44. willbe ineffectual to open ,or close the signal circuit.- said signal circuit into the slot 3 and is deposited on the leaf 7 5 of the arm 5,-the contact point 82 on said leaf 76 is therebv forced awav from contact 83. bv reason of the downward movement o said leaf75 being transmitted to saidlea 76 bv means of plug thereupon broken 1nd ,the signaling mechanism is nermittedtoproperly'r function. for

.the pulsatiom:` of current necessary? to operate the selective mechanism in the 'central station or exchange.

To prevent a partv fromV carri-'ing on a conversation while the coin is on the float arm 5. I provide interlocking mechanisms (circuit said coin is on said arm the talking circuit,

.and receiver and their operation.

by means of lead 90'. The leaf contact point 80 connects to the terminal 86-- b v means of lead 91. resistance coil 18. and The contact point 81Aconnects to y I lished, the push 43, and44 `of the signal mechanism. being' directlv connected to post 59.' so long as the points 82 .quentlv referred to comprises the lead 79. The circuit I is" v B Fig. 12)` wherebv, as long'asl that is circuit T is interferedwith or inv .terrupted VThiscircuit B 'comprises the following elements, 64, 96, 86,92, 18, 91g 75? p 80,781, 93', 8?, 97. and59, and is a bridging or shunting circuit having its terminals at said '.receiver post 64 and transmitter-,post 59.

Direct connection is thus established between said receiver post 64 and said transmitter post 59, shunting both the transmitter While this B circuit is closed and preventing conversation being ycarried on. nevertheless what I term the listening (cr L) circuit is established. and through this circuit a party,y at the calling station mayv hear sufficiently Well to determine Whether or not a 'response' is made .at the called station. VThis L circuit comprises the elements 27. 47, 48, 49, 33,

51, 5o. '55; 40, 42, 66. 64. 62. 38. 61. 63, 65, 6o, 58. 37. 57. 59, 67, 68, 69, 43. 44, 71, 52, 51a,h 34 and 28., bridged'b V.theB circuit.

To carryv on a ,conversation it is necessary to cut out the bridge. B. circuit. and this is effected by closing the F circuit,

throughthe means of the push button 19;

In Fig'. 13 this uF circuitfis shown as estabbutton 19 beine depressed,v and it comprises the elements 27. 47, 48, 98,"

the coilsfof theelectromagnets 15 and 16.

100, 86` 101, 52. 51, 34 and '28. As soon as this F circuit is closed it becomes energized, and connection with the called station having` -been established, with the receiver off itsl hook at said called station, a conversation can be carried on thereover.'

The circuit,A which has been fre- 10:2 which is connected to contact' point 1'2* yand lead 101, lead 101 to' post 50; also post 50. lead 55 to 103.'lead 103 to the coil of electro'- magnet 14;. and lead 104 from said coil to' leaf contact 11. This circuit is closed bv an attempt to insert a coin in slot 3. which attempt brings leaf contact llainto elec-v trical conncctiori with' stationarv contact`12t. When the T circuit lis closed the closing of this' circuit bridgessaid T circuit; and theresistance of the coil of electromagcurrnt through 'said coil, and its armature not drawn or [noted out fromunder the lever' 11, and hence the slot remains f #locked andthe coin cannot be inserted thereis attached to terminal 60 or 63. the transet 14 is suiiicient to prevent an operating' mitter alone is bridged by said B circuit; and in such case the response from a called station is clearly heard in the receiver 38; but When said lead is so attached conversation can be carried on by the calling station using the receiver both as receiver and transmitter; hence I deem it preferable, for general use, to attach said lead to post Gi. therevby bridging both the receiver and transmitter, as the response can be' sufficiently heard at the calling station to enable the calling party to know that he has obtained the station called for andthat the receiver has been and moved thereby) in one direction, While i if it is energized with a current in the other direction will tend to in the other direction.

A brief description of the operation of the device is z-Assuming a calling party desires to obtain connection with another party, (called the called party,') and the telephone. of said called party is oli its hook, (the R circuit at the called station being thereby broken) the calling party-will first remove his receiver from its hook, and he should at once attempt -to deposit a coin in slot 3. In case the calling party be on a party line and the T circuit on said line is already established, the U circuit which is established bv the removal pf his receiver, vas above, will beshunted by said T circuit so that sufficientcurrent willnot flow thereover and through the coil 14, (which is anlelement of the U circuit), to energize it and unlock throw' said armature lever 10; and said deposit cannot be made.

The party at the calling station will obvi` ously hang vup his receiver. VIn case, however, the calling party attemptsV to get the called party Without the deposit of a coin in the slot, (whether the receiver at the called station be on or ott' its hook), the S and I circuits aref established by the. act of removing the receiver at the calling station from its hook, and as hereinbefore explained, no signals which will operate the selective mechanism at the central station can be transmitted over the S circuit. Assuming, however, that a T circuitl has not already been established on the party coin is deposited in the slot 3, but with the R circuit broken by the receiver at the called station being removed from its hook, connection cannot be established on the calledv station, and ultimately the calling party will return his receiver to its hook; and it is immaterial whether said return is done before or after said calling party depresses push 'button 19. Upon becoming convinced that thecennection with the called station cannot line of the calling station, and the lbe made,

receiver on its hook), the calling party Will depressthe button19, and thereby establish the F circuit,` which will be energized by a local current, and the coin' which has been deposited by him will be discharged into (andbefore or after replacing thel runvvav, from the float bar, and returned to him in tray 8. I

Assuming the receiver at the called station to be on its hook, (with the normal and established condition of circuit R existing), at the time the receiver at the calling station is removed from its hook, there will thereby be established at the calling station circuits S and I, (see Fig. 1,4), andany signals which the calling party sends to the'c'entral station. `will b so interfered with andLs'hunted by said circuit I that the selective mechanism at said central station will not be operated so` long as said I circuit is unbroken. Further assuming that a T circuit is not in ekistence on the party line of the calling station and that the calling party deposits a coin in slot 8, before hanging up his receiver.said I circuit is thereby broken at contact points 82, 83, (said contact points being separated by the Weight of said coin) and the selecting mechanism being operated, the makes and breaks of contact points 43 and 4l. will operate the selective mechanism at said central station and make connection with the called station on circuit S. In the mean time, that is, While the selecting mechanism is being operated, the telephone instruments are placed on a closed local circuit. by closing or bringing together contacts 45 and 46; said local circuit comprising, (see Fig. 12) conductors 70. 67. to terminal 59, and conductor I 72 to terminal 64.

On the establishment of thevS circuit. as last above described, the partyat the called station may, or may not respond by removing his receiver from its hook. Il said called party doesnot respond the calling party will ultimately depress the button 19, and the coin will be. discharged from the float arm to passage way 6 and tray 8; and it is immaterial Whether the receiver be returned to its hook before orafter the depression of said button. If said called party removes the receiver at the called station lfrom itsy hook. thereby making a talking circuit at the called station, and responds further to lthe call by speaking into the transmitter, the calling party can hear said response; but as the T circuit at the calling station is bridged by the B circuit, (of which resistance coil 18 is an element),'so long as a coin remains on V`the oata'rm, conversation cannot be carried on; and thereupon, before a conversation can ,be had, the callingparty must depress the button 1,9, to discharge the coin from'the fioat bar and permit contact points 80 and 81 to separate and break said B circuit. The T circuit remains established and is free for conversation. On theiestablishment of the F circuit, by the depressing ofbutton 19, under theconditions vlast above set forth, said circuit isenergized by areverse current, on account of the translating operations caused by the removalof 4the receiver at the called station from its hook, and the armature is moved to discharge the coin on lthe iloat arm into runway 7 and safe 9.

Y1. 'Ina telephone prepay box, the combination of a iloat arm, 'means to hold said float arm in a neutral position, and said floatn arm pivotedl to"swing about, a vertical axis, a polarized relay, an armature for said relay,

'a connection between sa1d armature and said float arm whereby Athe float arm is deflected according to the movements ofthe armature, a plurality of movable contacts mounted onsaid arm, a coin seat on one of said movable contacts, and a mechanical connection between s'aidmovable contacts whereby they areforced to move in unison with respect,

' to each other.

2. In a telephone prepay box, thev combination of a polarized relay, a float arm, a vertical pivotal mounting for said float arm,

an armature for the relay, a driving connection 'between the float arm and thefa'rmature,

aleaf contact .above the float arm, a coin seat on said leaf contact, adapted to be dey iiected by a coin on said seat, a leaf Contact below said float arm, stationary contacts on said arm, means to insulate said contacts from sa1d arm, and a mechanical connection between the upper and lower .leaf contacts whereby said leaf contacts move in unison 4when deflected by a vcoin o'n saideseat,\to alternately come into electrical contact with the corresponding ones of said additional contacts.

- and said latch.

slot, a latch to said lever,

to prevent a coin y slot and a latch to said lever, in combina-h tion with a movable contact, a driving con? nection between said lever and said contact,

and a stationary contact adaptedto coact with said movable contact, leads from said contacts to the line posts of a telephone in- .,strument, an electro magnetic cil in one of said leads, an armature to said coil, and a drivln'g connection between sa1d armature 1 4. In a telephone prepay box, provided with a coin slot, means to prevent a coin from entering said slot. said means coniprising a leverA having its movable end in the path o'f movement of a coin entering said a driving connection between said leverl and a movable contact, A

said contact, anda stationary Contact adapted to co-act with said movable contact,line posts, leads from said contacts tosaid posts, an electro magnetic coil provided with a core inwone of 'said leads, an armature to said core and A a driving connection between said arn Amature and sa1d latch, in combination with a 'telephone 4transmitter and receiver,l and means to put sa1d transmitter and .recelver in electric 'connection with said posts, the `h relative resistance of said -recitedconnec- -tions lbetween said posts beingl such that when both4 circuits formed thereby are closed said core is inoperatively energized.

ODIVLON BRSBOIS.l

'In the presence of?- I f CHARLES TURNER BROWN, CHARLES B. Hnnon. 

